I once made the mistake of being too friendly and speaking to an Amtrak police dog while seated in the (SSL) lounge car. During a stop, the dog and his officer boarded the train and were walking thru the train. When they came into the lounge car everyone was pleased to see the dog and he was quite friendly with everyone.
When the dog came near me, seated by the window, I naturally turned toward him and made a few of those stupid "kissy noises" that we make to our dogs when we are petting and talking to them. The dog came much closer and began to sniff me and nuzzle my face a few times, which made a bunch nearby kids laugh quite loudly.
Of course the officer was not pleased with me and after a moment he and the dog continued on to the remaining cars of the train, before jumping off onto the platform before we began to roll. Needless to say we arrived at our destination safely and on time wishing that the police dog could have joined us the entire trip.
I have wondered how the police dogs react while going through the diner. Do they get excited with all the food on the tables, right near their nose?